From patchwork Mon Jul 31 12:10:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li Feng X-Patchwork-Id: 1814974 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=smartx-com.20221208.gappssmtp.com header.i=@smartx-com.20221208.gappssmtp.com header.a=rsa-sha256 header.s=20221208 header.b=EUUf5xO3; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RDxwZ0pffz1yfG for ; Mon, 31 Jul 2023 22:13:34 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qQRm1-0003Gl-1I; Mon, 31 Jul 2023 08:13:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qQRly-0003FE-Fb for qemu-devel@nongnu.org; Mon, 31 Jul 2023 08:13:15 -0400 Received: from mail-pf1-x42a.google.com ([2607:f8b0:4864:20::42a]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qQRlv-000595-RB for qemu-devel@nongnu.org; Mon, 31 Jul 2023 08:13:14 -0400 Received: by mail-pf1-x42a.google.com with SMTP id d2e1a72fcca58-686b9964ae2so2930148b3a.3 for ; Mon, 31 Jul 2023 05:11:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=smartx-com.20221208.gappssmtp.com; s=20221208; t=1690805470; x=1691410270; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=U6hnNimq9gNOgoPdgNvDGfaGEO+kLFO1RzZStHFpC58=; b=EUUf5xO39D5qtB5YEtBmWSgAcEXm/XvUhQBuXkb2EWPhW3WJNEcjYxxag+IInPfiAV epA64C88qKLSZUwe01nmceDsGSDwuT54fV6X8UBkXI5TSHvLEKVrIGHTukK+flNjbWXD QS7z+bdRkTgkIay7VGXWeZB3nrv3dSs1FKUATgXxprOFrun4GvESTbm8bAJcfcYBKERI 9zkwbbwwrQfxvjAri/LEL8Xdod1veH3SDvv7tzwWlPRt0iHTKmLFVKgej7l6yDgC8h5b 58JaEmFkt+kI9nEgUEhNfMesKU43qXV17QxpsrkrtbGSrBhR3NNtL8DH9xQz0zann4JQ G4Pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690805470; x=1691410270; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=U6hnNimq9gNOgoPdgNvDGfaGEO+kLFO1RzZStHFpC58=; b=kl1xHCgM4TfaRqX4aFZduI+4DbFv5LAaDIYoCyCDqKqeYsztIQWiwni/nLbx4zoiur 76bEUHIu08YvnDGUeHRZ2oXIrlForGVveiCZdxoLc+pCGbKhBYRIFQ76YKKV8XBQxvl8 RwQzm1W58sW6bWTq4GSbL9m//zz1IzKTT99V0cmZfJg2wBvfIt/uilFM2jTqKKklFNo2 h4D+alxaRJ4lRGHKt6Z8/JdQMNNLotiKtyViC5r0dewp5HLJf4qo47+JZiTx3T+qju8h 2detDZTBRSz3uwF683i4C1ez3NKg+UOEd6VBqZQsjN6VhB1kUvs0tRPc/+K26j/xFySb PEoA== X-Gm-Message-State: ABy/qLYsz8btH7DTCpB70QRBpGZLMD7j1k9O0wU7TMss10q3b6LaDHmw vFT/G9D6OZZHnjkN4gexYLe4vA== X-Google-Smtp-Source: APBJJlFPyD51QNitsaut6fZI7lVWk8EHlHKu8thh48KNkDkHVJuXY3eezMaEr782mY/KaZe4DYuCuw== X-Received: by 2002:a05:6a20:644:b0:138:60e:9c4 with SMTP id 4-20020a056a20064400b00138060e09c4mr6306011pzm.23.1690805469665; Mon, 31 Jul 2023 05:11:09 -0700 (PDT) Received: from localhost.localdomain.gitgo.cc ([47.75.78.161]) by smtp.gmail.com with ESMTPSA id a10-20020a62bd0a000000b005d22639b577sm7385690pff.165.2023.07.31.05.11.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Jul 2023 05:11:09 -0700 (PDT) From: Li Feng To: "Michael S. Tsirkin" , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Paolo Bonzini , Fam Zheng , =?utf-8?q?Alex_Benn=C3=A9e?= , Viresh Kumar , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Cc: Li Feng Subject: [PATCH v3 4/5] vhost-user-scsi: support reconnect to backend Date: Mon, 31 Jul 2023 20:10:09 +0800 Message-ID: <20230731121018.2856310-5-fengli@smartx.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230731121018.2856310-1-fengli@smartx.com> References: <20230721105205.1714449-1-fengli@smartx.com> <20230731121018.2856310-1-fengli@smartx.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::42a; envelope-from=fengli@smartx.com; helo=mail-pf1-x42a.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org If the backend crashes and restarts, the device is broken. This patch adds reconnect for vhost-user-scsi. Tested with spdk backend. Signed-off-by: Li Feng Reviewed-by: Raphael Norwitz --- hw/scsi/vhost-user-scsi.c | 199 +++++++++++++++++++++++++--- include/hw/virtio/vhost-user-scsi.h | 4 + 2 files changed, 184 insertions(+), 19 deletions(-) diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index ee99b19e7a..5bf012461b 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -43,26 +43,54 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_RESET_DEVICE = 13, }; +static int vhost_user_scsi_start(VHostUserSCSI *s) +{ + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + int ret; + + ret = vhost_scsi_common_start(vsc); + s->started_vu = (ret < 0 ? false : true); + + return ret; +} + +static void vhost_user_scsi_stop(VHostUserSCSI *s) +{ + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + + if (!s->started_vu) { + return; + } + s->started_vu = false; + + vhost_scsi_common_stop(vsc); +} + static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status) { VHostUserSCSI *s = (VHostUserSCSI *)vdev; + DeviceState *dev = &s->parent_obj.parent_obj.parent_obj.parent_obj; VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); - bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running; + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + bool should_start = virtio_device_should_start(vdev, status); + int ret; - if (vhost_dev_is_started(&vsc->dev) == start) { + if (!s->connected) { return; } - if (start) { - int ret; + if (vhost_dev_is_started(&vsc->dev) == should_start) { + return; + } - ret = vhost_scsi_common_start(vsc); + if (should_start) { + ret = vhost_user_scsi_start(s); if (ret < 0) { error_report("unable to start vhost-user-scsi: %s", strerror(-ret)); - exit(1); + qemu_chr_fe_disconnect(&vs->conf.chardev); } } else { - vhost_scsi_common_stop(vsc); + vhost_user_scsi_stop(s); } } @@ -89,14 +117,126 @@ static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) { } +static int vhost_user_scsi_connect(DeviceState *dev, Error **errp) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostUserSCSI *s = VHOST_USER_SCSI(vdev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + int ret = 0; + + if (s->connected) { + return 0; + } + s->connected = true; + + vsc->dev.num_queues = vs->conf.num_queues; + vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; + vsc->dev.vqs = s->vhost_vqs; + vsc->dev.vq_index = 0; + vsc->dev.backend_features = 0; + + ret = vhost_dev_init(&vsc->dev, &s->vhost_user, VHOST_BACKEND_TYPE_USER, 0, + errp); + if (ret < 0) { + return ret; + } + + /* restore vhost state */ + if (virtio_device_started(vdev, vdev->status)) { + ret = vhost_user_scsi_start(s); + if (ret < 0) { + return ret; + } + } + + return 0; +} + +static void vhost_user_scsi_event(void *opaque, QEMUChrEvent event); + +static void vhost_user_scsi_disconnect(DeviceState *dev) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostUserSCSI *s = VHOST_USER_SCSI(vdev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + + if (!s->connected) { + return; + } + s->connected = false; + + vhost_user_scsi_stop(s); + + vhost_dev_cleanup(&vsc->dev); + + /* Re-instate the event handler for new connections */ + qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, + vhost_user_scsi_event, NULL, dev, NULL, true); +} + +static void vhost_user_scsi_event(void *opaque, QEMUChrEvent event) +{ + DeviceState *dev = opaque; + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostUserSCSI *s = VHOST_USER_SCSI(vdev); + VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + Error *local_err = NULL; + + switch (event) { + case CHR_EVENT_OPENED: + if (vhost_user_scsi_connect(dev, &local_err) < 0) { + error_report_err(local_err); + qemu_chr_fe_disconnect(&vs->conf.chardev); + return; + } + break; + case CHR_EVENT_CLOSED: + /* defer close until later to avoid circular close */ + vhost_user_async_close(dev, &vs->conf.chardev, &vsc->dev, + vhost_user_scsi_disconnect); + break; + case CHR_EVENT_BREAK: + case CHR_EVENT_MUX_IN: + case CHR_EVENT_MUX_OUT: + /* Ignore */ + break; + } +} + +static int vhost_user_scsi_realize_connect(VHostUserSCSI *s, Error **errp) +{ + DeviceState *dev = &s->parent_obj.parent_obj.parent_obj.parent_obj; + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); + int ret; + + s->connected = false; + + ret = qemu_chr_fe_wait_connected(&vs->conf.chardev, errp); + if (ret < 0) { + return ret; + } + + ret = vhost_user_scsi_connect(dev, errp); + if (ret < 0) { + qemu_chr_fe_disconnect(&vs->conf.chardev); + return ret; + } + assert(s->connected); + + return 0; +} + static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) { VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); VHostUserSCSI *s = VHOST_USER_SCSI(dev); VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); - struct vhost_virtqueue *vqs = NULL; Error *err = NULL; int ret; + int retries = VU_REALIZE_CONN_RETRIES; if (!vs->conf.chardev.chr) { error_setg(errp, "vhost-user-scsi: missing chardev"); @@ -115,18 +255,28 @@ static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) goto free_virtio; } - vsc->dev.nvqs = VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; - vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); - vsc->dev.vq_index = 0; - vsc->dev.backend_features = 0; - vqs = vsc->dev.vqs; + vsc->inflight = g_new0(struct vhost_inflight, 1); + s->vhost_vqs = g_new0(struct vhost_virtqueue, + VIRTIO_SCSI_VQ_NUM_FIXED + vs->conf.num_queues); + + assert(!*errp); + do { + if (*errp) { + error_prepend(errp, "Reconnecting after error: "); + error_report_err(*errp); + *errp = NULL; + } + ret = vhost_user_scsi_realize_connect(s, errp); + } while (ret < 0 && retries--); - ret = vhost_dev_init(&vsc->dev, &s->vhost_user, - VHOST_BACKEND_TYPE_USER, 0, errp); if (ret < 0) { goto free_vhost; } + /* we're fully initialized, now we can operate, so add the handler */ + qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, + vhost_user_scsi_event, NULL, (void *)dev, + NULL, true); /* Channel and lun both are 0 for bootable vhost-user-scsi disk */ vsc->channel = 0; vsc->lun = 0; @@ -135,8 +285,12 @@ static void vhost_user_scsi_realize(DeviceState *dev, Error **errp) return; free_vhost: + g_free(s->vhost_vqs); + s->vhost_vqs = NULL; + g_free(vsc->inflight); + vsc->inflight = NULL; vhost_user_cleanup(&s->vhost_user); - g_free(vqs); + free_virtio: virtio_scsi_common_unrealize(dev); } @@ -146,16 +300,23 @@ static void vhost_user_scsi_unrealize(DeviceState *dev) VirtIODevice *vdev = VIRTIO_DEVICE(dev); VHostUserSCSI *s = VHOST_USER_SCSI(dev); VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s); - struct vhost_virtqueue *vqs = vsc->dev.vqs; + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); /* This will stop the vhost backend. */ vhost_user_scsi_set_status(vdev, 0); + qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, NULL, NULL, NULL, + NULL, false); vhost_dev_cleanup(&vsc->dev); - g_free(vqs); + g_free(s->vhost_vqs); + s->vhost_vqs = NULL; + + vhost_dev_free_inflight(vsc->inflight); + g_free(vsc->inflight); + vsc->inflight = NULL; - virtio_scsi_common_unrealize(dev); vhost_user_cleanup(&s->vhost_user); + virtio_scsi_common_unrealize(dev); } static Property vhost_user_scsi_properties[] = { diff --git a/include/hw/virtio/vhost-user-scsi.h b/include/hw/virtio/vhost-user-scsi.h index 521b08e559..b405ec952a 100644 --- a/include/hw/virtio/vhost-user-scsi.h +++ b/include/hw/virtio/vhost-user-scsi.h @@ -29,6 +29,10 @@ OBJECT_DECLARE_SIMPLE_TYPE(VHostUserSCSI, VHOST_USER_SCSI) struct VHostUserSCSI { VHostSCSICommon parent_obj; VhostUserState vhost_user; + bool connected; + bool started_vu; + + struct vhost_virtqueue *vhost_vqs; }; #endif /* VHOST_USER_SCSI_H */